B2321

NETWORKING: LIN COMMUNICATION SYSTEM: B2321: Driver Side Door ECU Communication Stop
B2321 - Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the front power window regulator motor LH and main body ECU (cowl side junction block LH) stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When using the Techstream with the engine switch off to troubleshoot:

Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

HINT
DTC B2325 is stored when the communication between the front power window regulator motor LH and main body ECU (cowl side junction block LH) stops.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT POWER WINDOW REGULATOR MOTOR LH)





(a) Disconnect the E3 ECU connector.

(b) Disconnect the I12 motor connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (BATTERY VOLTAGE AND BODY GROUND)

(a) Disconnect the I12 motor connector.





(b) Measure the resistance and voltage according to the value(s) in the tables below.

Standard Resistance:





Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Temporarily replace the front power window regulator motor LH with a new or normally functioning one Service and Repair.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

A -- END (FRONT POWER WINDOW REGULATOR MOTOR LH IS DEFECTIVE)